Hossain, Md Mozammel, et al. “Nitrogen Fixing Efficiency and Physiological Characteristics of Azospirillum Isolates from the Paddy Fields of North Bengal”. Jahangirnagar University Journal of Biological Sciences, vol. 3, no. 1, June 2016, pp. 47-53, doi:10.3329/jujbs.v3i1.28277.